When is UHF required?
11-21-2018, 11:26 AM
#13
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Joined APC: Aug 2007
Position: I pilot
Posts: 2,049
Originally Posted by galaxy flyer
To be pedantic, it’s the square root of the altitude of each antenna times 1.23. Square root of 10,000 is 100 x 12 equals 1200 nm.
GF
GF
11-22-2018, 09:34 AM
#14
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Joined APC: Jul 2017
Posts: 1,349
The guy that gave you AC91-70 was actually being pretty helpful. HF is required in oceanic airspace but different flight information regions have other, different requirements. So it's important to read-up since applying one rule of thumb to the wrong part of the world can sometimes get you in trouble.
A good way to start familiarizing yourself with this stuff is looking at the Jeppesen, paper orienation charts. They are full of notes and useful nuggets of information.
A good way to start familiarizing yourself with this stuff is looking at the Jeppesen, paper orienation charts. They are full of notes and useful nuggets of information.
11-22-2018, 05:28 PM
#15
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Joined APC: Jul 2013
Posts: 460
No, the routes off the east coast or those across the gulf for that matter do not require HF. What you may have to do, depending on distance and altitude, is comply with non radar and or lost comms procedures as directed by the controller. I just dealt with that situation crossing the gulf below FL250.
11-22-2018, 06:30 PM
#16
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Joined APC: Jul 2017
Posts: 1,349
Another thing to add is that “oceanic airspace” does not mean airspace over oceans. It means airspace in oceanic control areas (oceanic FIRs or OCAs within specific FIRs).
There are also specific routings through particular OCAs which do not require HF, like Blue Spruce routes, etc.
There are also specific routings through particular OCAs which do not require HF, like Blue Spruce routes, etc.
05-06-2019, 03:39 AM
#17
Gets Weekends Off
Joined APC: Jul 2013
Posts: 460
Originally Posted by Elevation
Another thing to add is that “oceanic airspace” does not mean airspace over oceans. It means airspace in oceanic control areas (oceanic FIRs or OCAs within specific FIRs).
There are also specific routings through particular OCAs which do not require HF, like Blue Spruce routes, etc.
There are also specific routings through particular OCAs which do not require HF, like Blue Spruce routes, etc.
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